Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/80344
Title: Products evolution during hydrothermal conversion of dewatered sewage sludge in sub- and near-critical water: Effects of reaction conditions and calcium oxide additive
Authors: He, Chao
Wang, Ke
Giannis, Apostolos
Yang, Yanhui
Wang, Jing-Yuan
Keywords: Heavy metals
Hydrogen production
Dehalogenation
Deamination
Mineralization
Subcritical water
Issue Date: 2015
Source: He, C., Wang, K., Giannis, A., Yang, Y., & Wang, J. Y. (2015). Products evolution during hydrothermal conversion of dewatered sewage sludge in sub- and near-critical water: Effects of reaction conditions and calcium oxide additive. International Journal of Hydrogen Energy, 40(17), 5776-5787.
Series/Report no.: International Journal of Hydrogen Energy
Abstract: In the present study, hydrothermal conversion (HTC) of dewatered sewage sludge (DSS) under sub- and near-critical water has been performed to investigate effects of reaction temperature and pressure, moisture content of DSS, and calcium oxide (CaO) additive on evolution profile and characteristics of gas, solid, and liquid products. Although energy recovery rate decreased with increasing temperature and pressure, significant decarboxylation and dehydration reactions led to hydrochars with best fuel quality at 320 °C. High moisture content favored decarboxylation reaction but reduced H2 and CH4 yields. Compared to that in the absence of additive, H2 yield increased almost 6-fold at 380 °C and Ca/C molar ratio of 0.2, resulting in 58% H2 and 26% CH4 in final fuel gas. The results suggested that mineralization of heteroatomic compounds and dissolution of metals or mineral elements occurred during HTC. Under higher temperature and pressure, heavy metals or mineral elements were prone to be immobilized whereas dehalogenation became more distinct. CaO additive not only facilitated hydrolysis and deamination of organic compounds but also accelerated further fixation of inorganic elements and anions.
URI: https://hdl.handle.net/10356/80344
http://hdl.handle.net/10220/40470
ISSN: 0360-3199
DOI: 10.1016/j.ijhydene.2015.03.006
Rights: © 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles

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